PlantUML is an open-source tool allowing users to create UML diagrams from a plain text language. Developed by Arnaud Roques
License: Open Source
PlantUML is an open-source tool focused on creating a variety of diagrams using a text-based syntax, making it suitable for developers and technical users. In contrast, MindMeister is a more user-friendly, cloud-based mind mapping tool that emphasizes collaboration and brainstorming, catering to a broader audience.